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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8317d83af825e0335abcae55f9bb331c345e199683aedc079ba7da97553348' 
  AND token = 'kDWCA0883WIgT3MU2qxfY9ZcBPCJu5ShOmbkE0zZlPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}